Thanks for the suggestion but we already considered this long ago & unanimously decided against it.
One single free account is perfectly sufficient to cater for our current needs, the bulk of our work is not software development with frequent commits, it's exploitation work that remains private until ready. Also most of the time we all separately work on different things really & we very rarely need to merge files. In the v3 tools release for instance, in terms of file production habib took care of the resigner app & reverse engineering to find patches while I put up the html & js ROP framework together, esc0rtd3w took care of all the testing (not a small job) & everything else. While maybe convenient, upgraded github accounts would not have helped us in the least.
We have already invested enough time & money in this endeavour without donations of any kind. We will not spend extra money on upgrading github accounts for more features.