Hey i dont know why but every Mercs group i ask if they want to join me they ask normally if i have enough money, i have right now 135K and only need for TSS 120K. Here is the real problem when i anwser my char says that i have no room for them but i have space for 900 troops (I want to recuit the Windblown, Stormcrows or the Second Sons)
That happened to me too, I got rekted several times by Moon Brothers while I was trying to buy them.