There were many signs when he was at Liverpool that he was a Grade A toss pot, and for our limited finances I wouldn't want to see us risk any amount of money on him.
Not only that, I just don't think he's good enough at all for the Premier League. Liverpool let him go for next to nothing for a reason, and clubs didn't pay the ridiculous money when he went through his little good spell last year, and now it looks like only Swansea are seriously interested in him. You have to remember the level he's at; I'd be expecting him to be tearing clubs apart in a Ronaldo-esque fashion week in, week out at that level to be good enough for us at present.
Martinez has said we don't need to panic buy and bring in personalities who could disrupt the team. I agree with him. Ince for me is too much of a risk for not much possible reward.