There are so many Sega games that fit that "shut up and take my money" category.
I wish they'd at least put out a new version of OutRun Live Arcade for current gen consoles although the absence of it is at least understandable, since Sega's Ferrari license expired in 2010 (though I think they were still able to sell it on the XBox 360 for another year or two due to getting a Ferrari sublicense from Turn 10).
There was a PartnerNet leak way back, before the Atlus merger, that showed that there were XBox 360 builds of Skies of Arcadia and the first Shenmue, which were verified, but they never saw the light of day, ru ores to be canned because the port of Jet Set Radio and Sonic Adventure to the PS3 and 360 underperformed due to being overpriced for straight ports.
Sonic Adventure already had a bunch of ports and I didn't need to buy it again, especially considering I already had the Dreamcast version. In fact, I have two copies of it for Dreamcast alone since I got a second copy when I bought a working Dreamcast from Kijiji in 2009 (it was one of several games the guy included) and I have a digital copy for PC I got as part of a Humble Bumble.
I don't have the original Jet Set Radio but I do have a copy of the sequel, Jet Grind Radio Future as part of a combo disk I got from a thrift store that also came with Sega GT 2002 for the original XBox (but playable on the XBox 360 if you have backwards compatibility installed). The sequel was alright but not really my bag.
I suspect Skies of Arcadia would've sold better than those two games on XBox 360 due to the rarity and secondary market value of the Dreamcast and Gamecube versions compared to those other titles.