then when it gets close to the end and the blinds will be so high it will just be a matter of luck because everyone just starts going all in on every hand
Actually.. near the end you will need to be shoving to stay in the game & also because the player your shoving into really shouldn't be calling due to the flat payout structure (depends on situation obviously).
As far as 'would they be profitable to build a bankroll for a newer player'? When DoNs were first introduced on the
poker sites I'd say that 'yes', it'd be quite profitable then because there were so many bad players in them (ie. players who weren't making necessary adjustments with flat payout considerations). These days, they seem to have just a ton of regulars in them & I'd think that to be consistently profitable in them that you'd want to read up on DoN strategy including late game adjustments (also how important it is to play much tighter in early levels compared with a typical sng).
There are plenty of DoN articles around. I'd definitely read a few of them before taking a shot at them... including ICM calculations in situations that will come up in DoNs.
One of the good things about DoNs, the decisions are pretty much automatic so it is easy to multi-table them (once you know what you're doing).
If you're interested in some articles & are considering giving them a shot (even in the lowest of micros) you can shoot me a pm & I'll ship you an article.