As you might expect, compensation has always been on the rise. In the 2000s, about $3-7 mil; 1990s, $1-3 mil. There’s a really good tracker here although it’s only updated through 2010. MLB has changed the rules and now there are slot values at each pick. For instance, the first overall pick slot amount in 2019 was $8,415,300 – and their pick Adley Rutschman signed for $8.1 million. Expect that number to rise every year. It’s been incrementally rising for about 40 years. Interestingly, it’s not all that uncommon for someone picked later than #1 overall to earn a higher signing bonus. The most stark example being Matt White earning a $10.2 million signing bonus from the Rays in 1996 vs. Kris Benson at first overall earning $2 million. Some teams at #1 overall (or any other position in round 1) might fear a more talented guy may not sign at all or demand too much $$ to sign. Keep in mind smaller market teams tend to find themselves with the #1 pick vs. larger market teams like the Dodgers, Yankees, Red Sox, etc. There is a lot of pressure to lock down a franchise-shifting cornerstone at #1 and it’s not a good look if you can’t even sign the guy.