I strip them down, clean everything with brake cleaner, then run them. Having that metal on metal shortens the break in period.
On a more sincere note I do at least a field strip so I can look at everything and make sure I'm not missing anything or I didn't get anything "extra" that I didn't pay for. Like other's have said, I want to see what's inside before I start blazing away. I do add some lube, but I'm not unlike M67 that after that I will run them until they malfunction. I do this at least once or twice to check the limits of the firearm.
However in reality, I usually end up cleaning it before I have a malfunction just because I get tired of that black ooze getting all over me and everything else.
My autoloader shotgun was really the only firearm that I shot until a malfunction (the bolt would fail to lock open). That was when I was shooting 6-7 rounds of Trap every week. Usually took about 3 weeks before I had to clean it.
About where I'm at too. Plus I just like to tinker and take things apart to put them together again.
Depends on the mfr tho. Hi-point you probably could because they don't expect the users to know how to clean them (that's what the LT warrantee's for, right?)
And of course, what's the harm in doing so.
Basically, is there a reason not to... no, so do it, is how I look at it.
It's an easy practice that removes a variable if there is an issue.
Kind of like checking the oil immediately after an oil change (if you were not the one who changed it and had not already done it as part of that process). Should I HAVE to do that? No. Do I do it? Yes.
Having worked in a shop several years, nobody else touches my cars
and even then I check the oil again afterward. Kinda like checking the chamber... one more check doesn't cost anything but not checking and missing something sure rains on your parade.