It won't have been £50k - in RL terms that isn't a nominal fee. £100k gets you a desirable halfback.
I remember a rumour that only Hull offered any cash at all - £10k was suggested. That was why we took the slightly unusual step of selling to them, as the other option was giving him away.
The rivalry, makes loan deals unlikely between HKR and HFC. Plus, in terms of SL, both have borrowed a fair bit more than they've lent. I'm struggling to think of many players either have sent out on loan to other SL clubs. Eden went to Salford, young Cunningham to London, and there's probably a few others. Hull used to take on a lot of Leeds kids to fill gaps, under Kath Hetherington, but have moved away from that.
A player going there for a month and coming back would just feel a bit weird - I know in some ways they're just another club, and it'd be convenient, but even still.