Something people tend to overlook with the B is that other nations have got decks that could take them, including partner nations already involved. As I understand it Australia is getting a couple of LHD from the Italians (please correct me if wrong) with a ski jump. The Japanese with their 'Through-Deck destroyers' (sounds familiar...) have decks that a B could launch from which might be useful with China having a carrier capability.
If you can't afford a big carrier to go with the C variant jet, then a small off the shelf carrier and B variant may be a good option.
Spain's AV8Bs will not last forwever and that's another possible B buyer if the money can be found.
Although the A variant is the most technologically straightforward jet and is the export variant for most partner nations do not write the B off yet.