Aha. It's all coming back to me now. In the TINAP days, we once had a discussion (prompted by a listener) about placing a Flattr button on the site and I remember saying:
'Feck me. Now we're not doing that and we're never going to do that.'
'Why not ?'
'Why ? Why ?! Because then I would just spend every minute of every day hitting 'Refresh' and exclaiming 'HEY LISTEN EVERYBODY. WE HAVE 3 FLATTRS ! and we'd never do another episode'.
I knew there was a sensible reason behind this rather irrational feeling of unease. Phew.