Have a neighbor that uses a NH 273 square baler behind his M. Works very well. He's got a nice side delivery rake that he uses, too.
Never seen him mow with it though...
I'd guess that you'd get 2 cuttings at least and very likely 3 per season. If you averaged a ton/acre (that's probably very low for your area) with each cutting and baled 50 lb square bales that would be 40 bales per acre or 240 bales each cutting and 720 bales for the season (assuming 3 cuttings). If you've got horse people in your area and good grass (orchard, timothy, etc.) you could likely get 4-5 bucks a bale.
Not exactly the path that Warren Buffet follows.. but it might interest someone that already puts hay up on a few small fields within 20 miles of you.
Put a post up in the local feed store or on Craigslist.
Or you could get a leg of lamb or two every year... :thumbsup:
AKfish