Yeah, Sunwayman is a business, and they are concerned with making profits. I don't think they're trying to fool you into buying something you don't need here, but a lot of people have asked for the V10R Ti to be given an upgrade to XM-L, and SWM is doing it (not to mention the clip upgrade that's been asked for by almost everyone who's gotten any of the V10 series). Most people would call that listening to your customers. The Ti+ is a significant upgrade from the old Ti. If you already have a Ti2, then it's not really an upgrade (unless the clip is really important to you), so you probably don't need one.
Sunwayman's not engaging in any sort of shady marketing to gain profit here, they're attempting to gain profit by offering an improved version of a product that has an excellent track record--this is definitely a legitimate business practice.
As for offering the new head to be purchased on it's own, yeah, that would be nice for us, but you can't really blame SWM for not doing it. If all you want is the new head, hit up BST a few months after these come out, and get one from someone who decides they like the XP-G version better.
Totally agree. This isn't so much a different variant of the same light, it's an upgrade to an existing product with several things that customers have asked for or been doing in the aftermarket. Upgraded emitter, screw on clip, Ti switch. If you don't feel the upgrades are something you need, stick with the current version and wait a year for the next upgrade.