I can't quite get the math right. $3.50 a bottle come to $105.00 for a kit, with shipping. Haven't bought one in years but thought they were more than that. Just checked last year's prices and $40.00 per lug was the high end. So it would be $120.00 for 3 lugs which usually give me more than 6 gallons. But being able to make it year round may have it's advantages.
Plus yeast, nutrients, mlb, oak, etc... I’m going from memory, but the point is wine from grapes is more expensive than wine from kits by about 50%. Certainly, I’m not saying it isn’t worth it. I do both.