Bit harsh that SSV. We got a goalkeeper (most desperate need) before the window even opened and a left footed centre back within a week. It's extremely common that most January deals are done in the final few days/hours of the window, due to a multitude of factors, including agents shopping for the best deals, selling clubs holding out for the best deal and/or holding on to ensure they don't need a player due to injuries during January. Contracts are very complex - involving agents, clubs, lawyers etc etc.
I'd rather have the club be careful to get the right players in. The better players are not leaving their current club early in the window unless they are either (a) Not very good, (b) Have an attitude issue, (c) Are surplus due to an overload in a specific position (in which case the selling manager will want to be certain he has adequate cover) or (d) the buying club makes a silly-money offer.
Look back at many/most of our past few transfer windows and we have brought in players in all four of the above categories; and with a few notable exceptions they have turned out to be crap in one way or another.