Product: Bank account or service

Today, I attempted to receive service at the Wells Fargo branch at XXXX XXXX XXXX XXXX XXXX XXXX, NV XXXX, inside of the XXXX 's shopping center at about XXXX on XXXX XXXX, 2015. 
My XXXX mother in law asked me if I could go into the Wells Fargo bank and get change for a {$20.00} bill, as we had just dropped her dog off at a 'cash only ' groomer ; to which she did not have correct change for. 
After observing the line and unable to quickly identify available seating for her, I sat her in a seat at the XXXX outside of the entrance, then I waited in line until a teller became available. The XXXX teller I worked with advised me he could not change my {$20.00} bill, unless I held an account with Wells Fargo. 
I returned to my mother, and explained what occurred. She quickly handed me her ATM card, proudly stating that she has an account from her many years of service with Wells Fargo ( recently XXXX retiring, due to her XXXX only a few years earlier ) and asked me to return, while she continued to wait in her seat. I returned the bank, to wait back in the line as I was instructed. When a teller called me over, I presented the Well 's Fargo card I was asked to, so I could get change for my same {$20.00} bill. This teller appropriately asked for my mother in law ( as it was her account ), to which I advised she was near by, but was sitting as she is XXXX. The teller again reiterated that I would be unable to get the change unless I personally held an account with Wells Fargo. I then asked the teller if I was account holder with the bank would I be able to use the same {$20.00} bill I was presenting to obtain change? The teller advised me that she could, without issue. I then asked if my money held any value to them, being that I am not a current member of the bank. The teller clearly advised me that it does not. I then asked for her business card, as I was not happy with her explanation of the value of my money. I was receiving treatment as a XXXX class citizen, who 's money holds no value outside of the Wells Fargo. A XXXX teller quickly intervened, and advised me the same - that my money does not hold any value in his/the banks eyes, unless I personally have an account with Well Fargo. He then provided me his business card, as I left. 
Are these deceptive practices in place to manipulate the public into opening accounts with the bank? 
Would these same policies apply if I was a 10 year old child, who saved money in my piggy bank, and wanted to feel as an 'adult ' by placing a {$10.00} bill in my wallet, instead of carrying a change purse? I understand that I am not a 10 year old child, instead I am an adult, who holds many bank accounts at multiple other institutions, who was just simply trying to assist my XXXX mother in law as requested. 
Luckily, I was able to go to the XXXX ( where my mother in law was sitting, as there was not seating clearly available for her at the Well 's Fargo branch for her to sit ) and they graciously assisted me in obtaining my change without any confrontation. 
I found it entertaining that as we were leaving the store, I observed a young child ( about XXXX years old ) with his mother, asking the man servicing the XXXX XXXX machine outside of the bank entrance, if he could make change so that he could by a small trinket from the vending machine. The man at XXXX XXXX quickly accommodated the child, unlike Wells Fargo was able to accommodate me because my money according to the teller 'has no value '. 
The name of the XXXX teller I worked with ( who in clear direct terms advised me my 'money holds no value with the bank, unless I hold an account with Well Fargo. ' just as the XXXX teller had advised me ) was XXXX XXXX Lead Teller. 
I do not fault the associates for following the rules of the branch, though their lack of empathy, and the banks seemly deceptive tactics used to lure new cust