I think that's the point, these spaces greatly prefer recurring donations because a) the aggregate value is usually more than a one-off and b) they're much easier to reason about, as they're more "evened out".
'a' isn't very interesting though. Preferring more money because its more is very very uninteresting.
'b' is probably the point the person was trying to make - if they'd said "I would prefer $32/month rather than $1000 one-off" it would be a much more interesting comment, talking about the relationship between value and the commitment to the space.