Advice

I bought a TiVo Bolt last January and it included a year of free service. I have just learned that since I bought my original TiVo in 1999, I am able to transfer my lifetime service one time to another device. Well here's the catch, I can only transfer it to a TiVo I buy from TiVo. I wish I knew this when I bought my Bolt - oh well. Anyway, I'd like to take advantage of this, but am thinking that if I'm gonna use a transfer, I should get the best TiVo possible and am thinking of getting the Roamio Pro 3TB (I can get that for $400 from TiVo). Here are my questions:

1. Does the Bolt offer anything that the Roamio Pro doesn't offer other than the 4K PQ (I'm using my Bolt as a MoCA with 3 TiVo minis and want to do the same with the Roamio)?

2. There is no deadline for me to do this so does anyone think it's worth waiting to see if any other 6 tuner model come out (I want to add more minis and so I'd really like at least 6 tuners).

3. Is the best place to sell my Bolt on eBay (it has free TiVo service until January - I assume that's transferable and should help with the sale)?

Any thoughts and recommendations are greatly appreciated!