I'm sure there are a great many factors to consider before taking on such a drastic change in circumstance, particularly for a footballer who's career is extremely limited, but I'm prepared to bet my entire life-savings (which isn't a lot unfortunately) that the salary being offered is smack bang at the top of the list. To believe anything less is bit fairytale, no?
If United offer Dier a weekly salary that would double the current one he receives at Spurs, I think he will take it with open arms. That's just my opinion though.
P.S
With regard to the Lloris example, well, you have to remember that these players are trained in all matters concerning public relations, and a great deal of what they spout in the press should be taken with a pinch of salt.