Okay, took the time to make a few calls around the area and check to see some variables. Here's what I got:
MV Agusta: all 3 dealers said that the valves are supposed to be checked at the 600 mile service -according to MV- and every 7,500 miles thereafter. The procedure is 5 hours of labor to check plus additional labor to "fix" if necessary.
Two of the dealers said that they don't recommend the valve service at 600 miles as it is uneccesary. The cheapest find I could have for this service was about 600 bucks with the valve check or a couple hundred without. So, that's 600 bucks every 7,500 miles and maybe 600 bucks when you get the bike. There's a larger charge for the rest of the service, this is just valves.
I called two places re: suzuki. I don't have my manual to my gixxer thousand, so I was running off the Yamaha manual.
The dealers said the service was at around 14,000 miles (much less than Yamaha) and that it was around 300 bucks but they recommended only doing it with an overall larger service of around 450.
So here's the numbers I've been given, whoever thinks I'm "being screwed" can find some better numbers. If you do MV's service and Suzuki's service as recommended by the manufacturer:
MV: 600 per 7,500 miles
Suzuki: 450 per 14,500 miles.
Is that not almost three times the price by the time you've reached 15K miles? Or perhaps more if you did the full valves at 600 miles??
Now, opinion time, I'm not doing a valve service on an inline 4 unless it's reached a few years old and I'm deciding to keep it. And I'm sure as hell not doing it on a 2V ducati under 20K miles unless it's running rough, especially given the cost of replacement engines on crashed bikes.
I would probably do the 7,500 mile on the MV just because.