I reply to them occasionally, as zaps are literally the only way I can obtain Bitcoin (very long story, not interested in getting into it again), but I also agree that it does feel like the people who jump onto those tend to not ever use Nostr for anything except gathering sats. I've intentionally turned down all but one of the ones I've seen since coming back to Nostr, simply because I was gone for a while and it didn't feel right to mooch off of that if I haven't been active.