If I may offer a single example/thought about the cost of buying & importing direct from the source, versus buying them from a 3rd party (be it Mike or someone else), then, try this on for size:
ZIPPY 'RHINO' 4900 4S (14.8v) 20C/30C (98A/147A) Lithium Battery £74.99 ($116.76) in the Uk plus shipping.
Rhino 4900mAh 4S 14.8v 20C Lipoly Pack $79.99 direct from Hobbycity plus shipping.
Exact same lipo, yet it costs nearly 50% more for the privilage of buying it from a UK retailer.
Now granted, there are factors such as shipping method, exchange rates and profit margins to concider, but I kinda doubt people would be willing to pay
that much extra just to support Mike, when he already sell plenty of lipos that perfom just as well or indeed much better, for a similar kind of price once you factor in shipping costs to get the Zippies direct, let alone after he's had to add on his own costs and profit margins; you might as well buy what he already has if you just want good quality, fair priced batts.
I love my zippies too, but I wouldnt pay over the odds by that amount just to support BRCHobbies for example, I'd rather import the batts and still save money, or look for a different brand already based in the UK (Flightpower/Trakpower for example).
{/economics lesson}