one dry-clean a suit (after every one or two wears, for example)?
Excessive dry cleaning obviously damages the suit, so is it better
to have it steam-pressed after every wear and dry clean sparingly?
Dry cleaning is a harsh process on materials, especially organic ones like wool. The most I seem to dry clean my suits is once a season if they are being regularly used. For suits I use more rarely I will dry clean more rarely. I have had suits that I only use a few times a year that I have never dry cleaned. Doesn't mean I won't, I just haven't used them enough to need it yet. Same goes with my sport coats.
I'm with this. There are many items in my closet that have never been dry cleaned. Too many people here seem to say dry clean at the end of each season, but there's no need if it isn't dirty.