I definatly think there may be something in using this as a step to a full sponsor, I just dont see the point otherwise. They could have given them 1.5m without anything more....
good publicity for both sides. This shows to the world that barcelona is "the peoples club", who play great football and are champions in every sense of the word. That is what barcelona is going for. That is much MUCH more valuable then a shirt sponsor is. It makes potential supporters (aswell as the current ones) feel good about themselves and buying Barca shirts and all that.
this is especially valuable in an age where everyone is getting fed up with paying too much for shitty p[layers and the negativity that surrounds most clubs these days. People are fed up with hearing about how ex-players threatened to score own goals and all that sort of sillyness.
People also have to understand the culture of Barcelona FC. This is not a commercial organisation like every other. The board has to pay a tremendous amount of money to even be on it and even then can get voted out by the supporters.
Barcelona is a club for the catalans a "local club done good" to the extreme and therefore this "getting a commercial sponsor" business has never gone down well with the supporters. Untill the supporters see the point of it (and they won't as it's a pride thing) barcelona will never have a commercial shirt sponsor as the Catalans feel that that would mean people wee to think of Barcelona as the shirt sponsors club...and not the club for the Catalans.