You're just going to make the problem worse. The best call is to disassociate Japan Legend from any translations, even keeping posts of raw chapters to a minimum, (thus keeping yourself safe). You can't stop people from wanting access to the manga for free, and any attempt to do so will either aggravate them, inviting more trolling, or simply lead to the creation of new scanlation groups picking up the series and duplicating efforts (as has now already happened which I have no doubt added fuel to the fire).
http://chillock-amt.blogspot.co.uk/2015/09/guyver-chapter-184-english-translation.html
As you can see from this groups comments, they've clearly made no attempt to engage with JL and actually understand what it is you were trying to do, they've just made accusations based on unfounded rumours that are circulating around the community stating "Guyver Advocacy are charging for their translations".
I'd personally be interested in knowing exactly how many volumes of guyver have been purchased through the pledge system since it began, and whether this justifies the continuation of the project. It was a great gesture, but without official instruction from Kadokawa it's not right for us to take this decision upon ourselves. For all we know, they may advocate the free international distribution to raise awareness in the hope a bigger publisher invests. Restricting access like this may actually be to the determent of the series.
Bottom line, be open and give it away for free, the wider community doesn't care...........be secretive and charge for the translations (even if it is being spent on the manga), people are going to raise an eyebrow and think you doing something shady.
It's a sad world we live in where everyone expects people to exploit each other for a quick buck!