It would be great if supports could have more options on what to buy before leaving the base at start of the game. Currently they choose 1 support item and 2 pots, because the prices are just so made that that is the only viable option ( 400 +100).
By making the support item 25 gold cheaper, it would open more options for the supports on what to buy besides the support item. Will you go for 2 pots, or 1 fearie charm, or 1 pot and 1 red ward? Having different choices is what makes the game fun and interesting. Maybe even adjust rejuvation bead to the mix.
The missing 25 gold could always be put back in the support items upgrade.