Can this rate of write kill the storage?(this is my main concern) After 2d 4h uptime i have ~1100 sector writes.
It was stated here by Normis, if I'm not mistaken, that the flash used by Mikrotik is rated to 100k writes/cell, and uses wear leveling. If your device has 16MiB of internal storage, and considering each cell is 1KiB, it would leave you with 16000 cells. They may be 512 bytes - that would give you two times more cells.
100000 x 16000 = 1600000000 writes. I would be conservative, and slash it to 1/10. So, 160000000.
At the present rate, of 550 writes/day, it would give you
160000000 / 550 = 290909 days. Something like 797 years.
With these numbers, even if the stated life would be 1/100 of the official statement, I'd say You should be fine.