The whole point of micro financing like this is about giving people the chance to afford more expensive, quality items. Instead of buying a cheap electric space heater that heats their place but drives up their electrical bill because of inefficiency they can buy a real replacement central heater. Of course you are right that it can be abused but at least they have the chance to make better financial decisions because of services like that or as Terry Pratchett wrote in Men at Arms they can now afford to buy the expensive boots:

The reason that the rich were so rich, [Captain Samuel] Vimes reasoned, was because they managed to spend less money.

Take boots, for example. He earned thirty-eight dollars a month plus allowances. A really good pair of leather boots cost fifty dollars. But an affordable pair of boots, which were sort of OK for a season or two and then leaked like hell when the cardboard gave out, cost about ten dollars. Those were the kind of boots Vimes always bought and wore until the soles were so thin that he could tell where he was in Ankh-Morpork on a foggy night by the feel of the cobbles.

But the thing was that good boots lasted for years and years. A man who could afford fifty dollars had a pair of boots that’d still be keeping his feet dry in ten years, while the poor man who could only afford cheap boots would have spent a hundred dollars on boots in the same time and would still have wet feet.