Missing the point?

Stafford Hospital is to introduce "pound in the slot" mechanisms on their wheelchairs to combat the number that are being stolen.  Can't see the sense - if you're after nicking a wheelchair worth several hundred pounds, you're not going to be put off by the thought of losing a pound, are you?  They are of course using the supermarket trolley system as their model, but this misses the point about what supermarkets are trying to achieve by their use of "coin in the slot".  They're not that bothered by the thought of people stealing their trollies.  No, what they are after is getting people to bring their trollies back to a central collection point (in order to get their pound back), thus saving them having to employ people to go round and collect up trollies which would otherwise end up abandoned all over the place.  If the hospital wants to do something about wheelchair theft, they could more usefully look at another system employed by some supermarkets whereby if you take the trolley outside a designated area, the wheels lock.  Now that would work!