I vote no as well. For so many reasons, but the planet thing is just a no.
It sounds like if I have two accounts with 12 planets then I keep the target 12 and get an additional 6 fused to the target (12/2) which came from the exodus uni. That gives me 18 planets total. Sounds like an easy way to absolutely pimp an account especially through a few mergers with this setup.
Merge 1 two accounts with 17 planets merge and you get an account with 25/26 planets. Grow another account to 17 planets and you then have the target account sitting at somewhere between 33 and 35 planets. Sounds like the unis just got a while lot smaller, this would look insane trying to manage, astro becomes absolutely worthless, and if you get a whale who truly wants to break the game it would be easy to create monster accounts via planet merges instead of developing one account. Here is how I would do it if I spent money in large quantities like some do:
Grow as 4-8 various unis to 15-17 planets. When the account gets there it goes v-mode warrior cold storage so you are not killing yourself managing everything. Merge 1, merge two accounts together so you now have half the accounts each with 22-26 planets. Stay cold storage and develop more for the same to keep the cycle going or play something as you feel like it. Assume you do not develop more but you can see where this is going to go. Merge 2, do your merging again so you have again half the number of accounts each with 33-39 planets. If you had 4 accounts to start this is where you stop. If you had 8 accounts you get one more merge to get to one account which has 49-58 planets. Viola you are a monster who spent way too much money on the game but that account would be insane. If you kept getting accounts merged every time then eventually you could keep the one single account as the target every time and end up with something stupid provided the game lasted that long. 8 accounts going to this stage already took 8 years from now since merge is every two years and they are not going to implement this method now. If the game lasts longer and you were dedicated to making a monster account this way in theory you could fill a large part of a galaxy all by yourself.
That is an insane and extreme example but you look at how much time, dedication, and money some people spend and tell me there is not one player who would do this provided I understood your concept correctly.
There are many other reasons for a no, but that was just a super fun one to explain because could you imagine an account with 50 planets 
Congratulations on a nice ninja and fr to defender.
Enjoy your profits! Defender, GLOTR.
