What goes around, comes around. Purchasing agents for large companies learn this lesson early in order to keep job security. A salesperson visits the companies that you want to visit too. You would be surprised how another salesperson can help your business succeed. I get what I need through my networking contacts.
Marketing happens everywhere.
I've cleaned many a skid mark off the toilets in our offices. At the same time keep in mind your professional career growth will be affected by these types of decisions. Always take the good and the bad. Own up to your mistakes. If you make a mistake, you prove you are doing something worthwhile.