OK, had been meaning to post on this thread for a while now seems a good of a time as any.
Firstly, there is no advantage to somebody who can afford to re-enter. All it means is they can buy in (just like an alternate) and if they play differently and gain an advantage from this then if it is an advantage they should have been doing it anyway (re-entry or not), if it is not an advantage then they are juicing the pot, sometimes you will get eliminated by somebody making a poor play, that"s poker and you want them to do that anyway.
Also the re-entries are not compulsory so you lose nothing if you were not going to rebuy anyway. It"s APAT and there is a bar and apater"s being out is not so bad. In fact being out is sometimes too much fun and it has in the past made a difference to a decision I made, when I was thinking if I go out, do I really care? Most of us don"t have any fear of being out, I will just enter the next one anyway, which is the same as a re-entry I just have to wait until next month (in the grand scheme of things this is exactly what it is). Actually if people are playing with a fear of going out the a re-entry is a good idea for APAT as it would teach people not too, just make the right play, if you run into the top of somebodies range on this occasion or get outdrawn, so be it - the bar is still there. The fact it is a re-entry does not make a decision that would be a fold in a freezeout a call. The EV of the decision would be exactly the same. For it to change there would have to be a huge metagame (which there is not at an APAT event).
Obviously we can"t only have them in certain circumstances, but somebody wanting a re-entry should go to the bottom of the alternate list so they might not get back in. If I did win an APAT after re-entering it would not feel tainted in the slightest to me.
I agree re-entries and rebuy"s are different, would not be in favor of a rebuy event (accept as a side event which would be good).
So overall I am for re-entries and see no reason to limit them.
One case that I do think deserves consideration though. The reason I still play apat tournaments is because I met a lot of apater"s during them and really enjoyed spending the time at them, it"s this that brought me back to apat and doing so has in turn improved my game I think. Re-entries risk the removal of this which I don"t think should be under-estimated.
But at the end of the day, re-entries will reduce the variance and favor better players which I all for.