Depends what you consider indie I guess, but clearly, you haven't played Factorio or Terraria.
Stars in Shadow and Interstellar Space also have a crazy amount of replayability (if you try to beat the highest difficulty with all the races and possibly different galaxy settings and different paths to victory) similar to the MOO 1 & 2 classics they are clearly inspired from.
Streets of Rogue also has quite a bit of replayability if you try to beat the game with all the different characters (they have a lot).
Haven't finished ADOM yet (and I played a fair bit), but I see reviews with hundreds of hours on Steam. Similar Story with Tangledeep.
And don't get me started on Battle Brothers, Dead Cells, Stardew Valley or Shovel Knight (I bought the game early on and was upgraded to the Treasure Trove for free). The first 2 games in that list in particular are big time sinks.
Towerfall also has a fair bit of playability if you try to beat the hardest difficulty with friends in local coop.
The Blackwell series, put together, also took a decent amount of time and so did FTL to unlock everything.
See, I think you just haven't played the right indie games.
Also, with less than an handful of exceptions that barely exceeded that, I don't pay more than 30$ for a single game on general principle, indie or not. Save for very few gems like FTL or Factorio, I have a difficulty recalling games I've played in recent memory that would have justified having paid more than that (indie or not).
See, AAA games cost a lot more to make, but does it matter if I don't appreciate the direction where the energy was directed? Honestly, in terms of aggregated entertainment value, AAA games are not really better than indies for me (indies just have a tendency to pack the same amount of entertainment in a shorter time period for cheaper and personally, I'm grateful for the economy in time and money).