What does any of that have to do with the price of tea in China? Politicians on both sides of the aisle are expected to raise money for their party. If you want lucrative committee appointments, you have to buy them. Edited to add a source from the other side of the aisle: https://www.brookings.edu/blog/fixgov/2017/07/21/problems-with-the-committee-tax-in-congress/

It's simply the way the game is played (although in all honesty, my comment is somewhat tongue-in-cheek, as Fetterman -- being a career politician -- undoubtedly knew this long ago).