The value of a rider is worked out on the basis of their points return in previous years - Menchov as a 2 time Vuelta winner, Giro winner and TDF podium guy is going to be worth a lot more than FS who has yet to finish on a GT podium and has I think 2 stage wins, Nibs for example before the Giro had done nothing to make him more than a 3 point rider. Values change by season rather than race.
I'm afraid we have to work within the coding of the game, but if you think the scoring is out of whack and can take advantage by assembling a super-squad for next to nothing then go for it.
Don't forget that points are awarded for stages (places 1-15), GC, Mountains and Points.