I agree, twenty requests for invites a day in every popular thread are annoying. But that's not even the fault of these guys, registering on OT.com and then asking for myspleen invite in the only way to get certain edits/preservations. They are just some dudes, who get excited about certain project, and start asking for directions when they can't find it on TPB. The one you replied to probably just wants to get the movie before the weekend.

As for hit'n'running, it's not even an issue on Myspleen. All popular torrents are stocked with of high speed seeders. I rarely even get to seed anything, someone who gets the release can leave his client for a week and not send a single megabyte.