Why are we allowed to have only one main? Why can't we transfer items between chars? Why can't we send an alternate char to a high lvl with 'skip the fun' and keep our main?
If these things were allowed, fewer people would be in the same old grind. People would experiment with entirely different chars, even trying them out before they go in for the final decision on the build they want.
I'm not saying sending a char to a high lvl should be lvl 30, but just high enough to get a feel for the overall style of play, maybe 25 or 27 and of course have them stuck there. And items should be transferable if you choose a no gold signup bonus.