The problem with reincarnation that it is limited to 6. This everyone, to max the it character, does 6. What if reincarnation had NO limits, but the xp doubled each time instead of the current 10 percent? Most would stop at 2 - enough to get them to rank 25. A few, enterprising ones might go to 5. One or two (Corey, maybe me) might try for 7 or 8, but at that point xp maxing becomes a VERY real issue.
People would just stop eventually because the reward to effort would no longer be worth it. Everyone could decide where that line was for themselves. Of you want to grind out 100+ days and hit R10...then may Paladine bless you!