Not user friendly or functional to require a Fundraiser in NXT be an RE User. P2P fundraising happens via multiple channels and these days, platforms (i.e. Facebook) make it easy for the prospective fundraiser and donor to raise funds. Not every P2P fundraiser needs access to RE. For example we have people creating "Birthday fundraisers" on facebook all the time and I have no way to credit them in RE NXT without first going into Database view and marking them as "solicitor." While this is fine for someone who toggles between both, it makes it impossible to do my work in NXT 100%.
Alternatively, there could be another way to recognize a fundraiser or solicitor of funds without having to "soft credit"