"and if it worth selling the the coming Q10"
Think about it.
Where would you buy them and at what price?
Where would you sell them and at what price?
After expenses (selling on eBay and accepting payments through PayPal is not cheap) would you be left with a profit?
Finally: how do you compete with all the large retailers who purchase the Blackberry for a fraction of the price you would pay? Why would anyone buy from you?
Think about it. If it were that easy, everybody would do it.
Even I would do it and with my feedback rating would attract a lot of buyers! However I know better.