Not many. Bikes as rule don't keep their value very well and rarely become collector's items. Check out ebay, Craigslist or similar to see what such a bike will sell for.
Yes, BMW make excellent motorcycles but they are pricey
Are you interested in selling your bikes for money?
Yes!
Made bikes
they do. But it will be a lot harder.
They can be if your not careful. But there a lot of fun
a lot
No
Bikes do not pollute in their normal course of operation. There are pollution issues with their production and their disposal, but a lot less then most forms of transportation.
Honda is a lot better then suzuki. From what I have seen, Suzuki is by far the worse. My buddy has an rm-z450 and its a pile. Honda is a lot better but Yamaha bikes are the best
Halfords have their biggest sales on bikes in the Autumn to winter time because there won't be as many people looking for bikes and therefore won't lose as much money
Most of them yes.