We have this type of information spread at several places so I figured it would be a good idea to gather in one spot. Anyone can feel free to share whatever they want. I'll go ahead and post some of the things I've come across. Apologies ahead of time to the original sourcex because I honestly don't know who created many of these charts, but thank you! Even though this thread is closed, it will constantly be updated!
GLU CC:
https://glumobile.helpshift.com/a/mlb-tap-sports-baseball-2020/?l=enTeam Upgrades:
Bronze 1-20=
94,600Silver 21-40=
312,500Gold 41-60=
1,075,000Platinum 61-80=
3,170,000Diamond 81-84=
1,850,000Diamond 85-100=
68.5k gold
Using the multipliers below, you can compute any ratings at level 10 for any tier:
Silver-
1.61Gold-
2.14Platinum-
2.82Diamond-
3.66
Example: A rating of 112/110 at bronze 1 would be 410/403 at diamond 10.
Below are the leveling costs for all bxp players with and without various discounts:
(note: keepers/ML are shown without any discount)


Below are prime/legends listed with and without discounts:
(note: atgs are listed w/o any discount)


Below are the club leveling charts. The levels shown will take them to the next level. For example, to take a club to silver 1, you need 22,352 gloves. To take a club to plat 1, you need 469,999 gloves.

If you're not having fun, you're losing.
Comments
The chart below represents the expected values per million loyalty points(Thanks to Shou!):