but, as I said, in that case, they already have ways to do this.
and I believe some MM modules have already been ported by 3rd party in co-operation with the original author. how/if money exchanges hands is between them.
anyway, there is nothing stopping a dev, doing a crowd funding initiative if that is there desire.
I do agree it would be nice to encourage devs to port more modules, and this has been discussed a few times on this forum incl here.
but money is not usually the driving factor for open source developers.
rather the way to attract them is to remove barriers/obstacles, which is what @danngreen is doing a great job of with 2.0 (and even prior)
I also believe 4ms also has donated some MM to devs to encourage devs, by removing the cost of entry.
however, that only really works if the developer is already into hardware modular, and unfortunately for many (users and devs) vcv is an low-cost alternative to hardware, so are not into it.
anyway, my experience on a different platform (Percussa) as a dev, is that users are pretty generous, assuming you do good work.
I created a number of modules for the SSP, and just accepted donations, and the more I delivered/release, naturally, the more donations I got.
(and yes, Percussa were the most generous of all 
)
as I was doing it in my free time, I much preferred having this ‘informal’ approach. there is no way, I would have taken money to create/port a particular module (I have been asked many times), because you then have to commit fully, and also start running into issues associated with user expectations/managment.
(something Ive no issue in my job as a developer, but not something I want for my ‘hobby’ ;))