I still have 104 of those things. Guess I should go ahead and do it.
You can still spawn them, like on the prospector in Scorpion Gulch,
but after you have used the 50 for "you know what", then any star cap
you collect after that turns into just a bottle cap.
But yeah, the Wiki is wrong, or the kids who edit it are usually wrong.
There is technically no limit to the amount of star caps you can collect,
due to a few locations have the re-spawning type.
...and yes that is a most awesome weapon.