Why isn't XBY on a major exchange like Bitt or Polo?
XBY will be listed on all big exchanges when the tech is ready and when no more bugs will occur. No need to rush

It is still experimental and that's why we call it a high risk high reward coin hence the price could (or better
will) go 10x/100x/1000x in the future..
OK here - early big nodes will be worth less than later small nodes
No, early big nodes will always be worth more than the smaller nodes because they keep the system running and earn more profits plus they will contain the double amount of XBY's and because XBY is a deflationary currency where all 650 Million coins already exist that means smaller nodes mathematically cannot be worth more than the original level 1 nodes. If you want to buy more XBY grab more BTC instead of trying to spread bad FUD around here

5 USD a coin would suit me just fine

But there is as total supply of 650mio! Maidsafe has 452mio and its worth 0,53$ right now, market cap: 240mio USD.
I do not know why you all are so convinced about attracting big whales, but I think we can be happy if this coin reaches more than 25 Cents.
The biggest mistake new comers do is comparing supplies of other coins and their respective prices...it doesn't work like that.
Price of a coin depends on many factors, supply is probably the last on the list (unless inflation is a million % a year).
You can't compare XBY with maidsafe based on their supply, their 2 different projects and are their prices depend on factors that are common and alot others that are different.
Try not to think of supply as the thing that determines the price of a coin only...