Sometimes I don't understand some players who start the game with A2, A3 A4 A5 A6 A7 A8 with these cards already going all-in thinking that A is the only card that will come out on the table and always having the chance that it will happen to really win , players are so excited about A when he takes it in his hand that he doesn't give up, even if his opponent has a royal. I think they should study more poker before starting a table by pushing all in ....
Depends on plenty things, stack size, tourney type, an A5s is a pretty good preflop card in a hyper or a short stack turbo - especially 6max games -, of course depends on where you are in the tourney, in the bubble not okay, but if you just reached the ITM and you are short-stack okay, at least for me, also okay in rebuy against opponent on tilt, range, from back positions.
Anyway, based on stats, plenty are profitable, whose doing it, I saw highly profitable low, mid stack players do it, otherwise, the blinds eat you and never win a single tourney, of course, they pay attention for everything, others stack size, stats, etc. what run they have, and plenty more, they are not neccessary bad players. plenty times you have the
odds, with cards like that for preflop allin. Ie.: 80BB mid position, behind you everybody under 25 BB, maybe small and big blind under 15-10BB, for me any A suited connector allin, there will be KQ and all the smaller pairs whose calling it, and you have at least 30% to win the hand, often it will near to a flip, with triple, 4-5 times higher stack, it is good, if you want be on FT, and win the tourney, if you are okay with some mid ITM position, as the blinds eat you, then wait for monsters, what will come rarely, and as you become short stack until they arrive - if arrive, everybody can call you with any cards, and earlier or later you are out from the tourney with monsters....