Novatx, if you are including ALL hobbyist, I agree.
But a SD/SB relationship is somewhat akin to a contractual agreement.
Each relationship has its own goals and boundaries that are to be hammered out between the two before an agreement can be reached.
As to the OP question, at this time I have an ATF.
To have a SB, it is much more than a hobbyist/provider relationship. Essentially, in the end, both parties part ways better off in their respective lives. There is a kind of mentorship also.
Because of this, these relationships should not be taken lightly.