Hmm... on the collection front could be a niche that do it just for historical reasons or novelty reasons... that said - I don't see them accruing much value due to the fact that a similar product could crop up and fill the niche if there was ever a demand spike for these kind of odd deals. (that said, the demand spike is more likely just novelty collectors and non-collectors trying to buy random uninformed gifts for the collectors in their life - since there's already near complete libraries floating around of NES and SNES titles, both NH and GR style for people who just want to play them).
Though that is sort of Retrobit's shtick - basically profit off of casual nostalgia and uninformed purchases - they seem pretty straightforward about the fact that they're not positioning themselves towards a more serious market.
All that said, there's far better options for pretty much every niche than retrobit - for casual players of old physical games? Hyperkin (Retron5), For new collectors who don't have CRTs and don't want to worry as much about hardware failure? Analogue or RetroUSB (how I hope they eventually get around to doing this for the other Cartridge systems), For people just looking to play old games? Raspberry Pi systems. For People wanting a "plug and play" option? The plethora of official and unofficial repro all-in-one systems of varying quality.