I just wanted to say that i spend all my Vit in the last Sereitei atack. Now i have 7k Vit and im pretty sure im already able to get a partner in a normal UBP (35k crystal).
Im saying this because i want to make you guys think if is worth or not to save and save and save Vit for months. Maybe if u aim for a sereitei atack because more vit = more stones, but in UBP you dont get nothing more than the partner (Main purpose) and some misserable stones.