There are plenty of sportbikes that will do 100mph in first gear.
And like I said, don’t be hung up on the displacement.
There are plenty of 600cc class bikes that would make GREAT starter bikes. Like I said “There are many flavors of good beginner bikes. None of them are ridden by Mr. DiSalvo.” If it’s a cruiser, or a sport tourer, or something else, an even bigger engine might not be a worry.
Heck, you could even argue that a Gix1k would make a better starter bike than an R6 because the power delivery would be much smoother. Lack of smooth is what gets you in trouble, and a modern sportbike is plenty twitchy out of the box.
And on top of that, there is absoultely NO need for a supersport on the street if you’re just going to cruise, why not save the money, and insurance, and gas, and get something that suits what you want? All it’s good for is bench racing and growing your e-cock on the intraweb, but that does sound like about 50% of what you are basing your decision on right now.
And on top of that, bikes that would be considered a good “starter” bike are going to hold their value, and sell just as easily when you move on to your next bike because there are tons of people that want them. They aren’t depreciating like a rock falling of a cliff, and they aren’t going to take a huge dive in price if it tips over and gets scratched.