Hi i bought like a kilo mealie's for about 10 Euro's (Thats like 9 dollar).
Thats like 17000 mealies..
I read you can only feed them about 7-10 mealies a day, is this correct?
Than they would last me 566 Days, they wont keep good that long would they?
Whats the best way to keep them allive?
Can i also freeze them or so to keep them okay longer time?
If i buy like 50 mealies i pay like 3 Euro's (2,50 Dollar) so thats why i bought in bulk..

Here is some information from a widely used Mealie vendor that may help you keep your mealies longer

http://vita-mealie.weebly.com/how-to-care-for-your-vita-mealie-order.html

It might be best to find someone near you with either sugar gliders or reptiles that you can share some of the mealies with. You can also put some out for the birds now and then.

Sometimes buying in bulk saves money but not if you are going to end up wasting 75% of your purchase

No,

Thats true, are there any glider owners here from holland?
Or did anyone freeze their mealies while they are allive in the normal freezer and them feeded them afterwards?

Or maybe its an idea to blend them up and freeze them and mix them in the BML?
Or should i just keep them as treats better?

with that many mealies you could start a mealworm farm. I have one! I actually love it. I'm facinated. If you raise your own you will save a lot of money.