Demoted from Alpha to Beta?

That isn't how it works unfortunatley. You got into the Alpha from registering for the Beta (they selected a certain amount of users from the Beta for the Alpha), you weren't entitled to the Alpha, that was a bonus, you were only ever entitled to the Beta
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Avatar (beta) is Alpha SA, Alpha, Beta and Delta subset at this point in time

I'm fine with alpha and beta test.It usually helps devs to polish their games and get feedbacks from alpha/beta testers.

But give money for an unfinished game(this already excist),pay to be a beta tester,i don't see what's good in this business model,for both sides (consumers/developpers).....

Not interested.

Your level doesn't carry over from the Alpha.

It's not going to carry over from the Beta either.

Basically if you join alpha ring the bugs can get worse as these.are advance betas before anyone else and before sending to beta and lower rings

Thats why they limit the testers

Its not for everyone and we get complaints from alpha testers or even beta testera on forums even though they aggree to the test and get some bugs and they still complain