This statement match very poorly with your statement "it's bubble".....
No it doesnt.
Would you sell your house your grandparents bought in 1950 for $20,000 and gifted to you, knowing that to buy the same house you would need $350,000 now?
No.
Because you still want to live in it, and you'll probably be around a long time. So selling out would net you a very small overall gain, due to a continued need for the utility. It would only make sense to sell if you believed the utility itself would lose its value, for instance if you wanted to relocate to another geographic region.
Same scenario applies
I play EU. Every hunt run of mine is 1000+ PED. I can use the income from the CLD I purchased right now, and I dont see myself quitting for another 5 years, so I have 5 years of CLD income left to enjoy before selling, of which I will see a steady return on my investment on, and then be able to sell when I choose to move on from EU entirely.
Since I've already made my money back, there's no reason for me to cash out as long as I have confidence that my deeds wont drop below my purchase price. I have that confidence, so I keep them and enjoy the residuals.
However the current price cannot be justified, for a new buyer. It's simply a foolish gamble.