Welcome to the site. You'll enjoy it here.........a lot of good information.
There is a thread or two regarding valve seals if you want to do a search. I ride an 04 SEEG and I had bad valve seals early on and they replaced them under warranty. I knew something was wrong by how much oil I was using......a quart in less than a thousand miles. That became apparent a lot quicker than the fouled plug. After two fouled plugs and several quarts of oil, I took it back in and they replaced the seals. No problem since then.
By the way, when they replaced the seals, the got something all over the top fins of my cylinders and I couldn't get it off and neither could they. So my bike went back in again for new cylinders, too........that they paid for.
Not sure that it's a real common problem with the valve seals however, it's not real uncommon.