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OneDrive is much better than the Dropbox, Onedrive give you Unlimited space with Office 365 for $70 year
We would like to give you more money for more space. Please let us do so.
I upgraded to 3 TB but soon I'll be out of space. I can't justify going to a business plan as I'm only one user.
The best option would be "unlimited" storage where you just charge us for what we use by prorating it each month or each day/week. At times I need 3 TB (or more) but then I go way back down as I purge video footage.
Realistically the best first step is to allow us to purchase more space in chunks though. Come up with a price for an additional 1 TB and let us buy in those increments.