He did seem to be genuinely interested in what they were doing, and told at least one of them to get in touch if they needed anything. Hopefully he didn't see the cheques as a one off. It didn't look like that to me.
I didn't think he was being tight with his donations, which I did feel last week, even though the totals weren't that different. He seemed to be giving the money more freely, and I also suspect that he's not got huge piles of cash floating around waiting for him to give willy-nilly. If he's been building up a business, he's probably been reinvesting a great deal of what he has made. If he made himself ill due to over-working, he's probably not been that extravagant in spending it on himself.