Too much double-cue usage in this thread.
You're not forced to buy champions, whether its with RP or IP, as you're given free champions to play in weekly rotations.
RP to IP Conversion would allow people to buy runes with RP, which is (from my point of view) the 'selling power' argument.
Who's pretending? If someone would rather spend their IP on runes instead of champions then that is their choice.
Versatility is a luxury. You don't need it, but its good to have.
Most of the arguments iv seen here to state that you're forced to buy this or that... are saying that you're forced to buy something that isn't needed.
So your argument is you had to make a decision between buying that new champion with IP, or getting some runes? There really is too much double-cue in this thread.
I hope you're not voting in the upcoming elections, cause you'd probably end up arguing about having to make a decision between one or the other and complain about "why can't they both be president"
Edit: After thinking about whether or not i'd continue to play the game without buying a single champion... My answer is Yes, I would still be playing.
They ARE selling power, just indirectly, you're paying 975 RP for 6.3K IP if you were definitely going to buy the champion.