Nope never for me.
It's not Healthy.
Period.
The end
Unless your attending a Social or something together?
The only way this would ever be healthy is if that Friend did like you mentioned when push comes to shove help in any form without question or if you would,also be there for them without a blink of an eye like friends do.
I'm not saying hobbyists do not make great friends but yes only in the hobby.
I vote no...
And be firm in separating the two so no feelings are hurt in the future?