Certainly a valid point. United, for example must consider themselves in a weaker position within the transfer market when players know that LvG is only there for [in theory] another year.
See posts #10 & #12 on this thread: http://www.saintsweb.co.uk/showthread.php?45712-Keeping-track-of-the-contracts&highlight=keeping+track#.VyyGv_krKHs
Yeah, there was a piece on this a while ago where West Ham seemingly will throw a BIG amount of money at a pricey striker.
Bony / Benteke / Lacazette / Batshuayi were all mentioned then as well, I believe.