I do think it would be more valuable to company owners like me to have those codes stackable and combine them in one account. If you bring out a Tier 3 with (let´s pretend) 30 Users, it will still not serve my needs as I need it for at least 50 Users for example. If Tier 2 would be stackable, I would have simply bought it 10x and thats it. Problem solved. Tier 3 which is stackable is obviously also a great option!