I think we shout stick to topic - even though team chemistry is somehow related - it's a different subject with pros and cons.
In regards to the topic - I must agree. It's as simple as that. Allowing teams to simply "buy" is not ok.
BB always had a time deadline for the playoff. We even implemented something similar in B3 competition as we saw some finals with two over the hill teams in term of salary competing.
In terms of such deadline removing the surprise effect of the cup we can maybe have different rules for 3rd div / 2nd div and first div teams...
For example: 3rd div teams will be able to buy 2 players after the deadline passed. 2nd div teams will be able to buy 1 player and 1st div team won't be able to buy any player... (Just a thought don't judge the numbers...:) )
"Did you miss me??? - "With every bullet so far..." Al Bundy