Because I'm rich (in Hay Day) and all my fishing spot are expanded then yes, I would buy it all again.
Now regarding your situation:
Once you reach the level for lobster and later, you will get lobster soup (need 2 lobsters) for boat orders. Would you cast off all boat or rely on your lovely neighbor?
Right now lobster is time consuming to get, it may change in the near future. You better get the lobster pool as soon as possible and upgrade it to its max capacity (6 lobsters). First upgrade needs 45000 coins and 12 h, the second 52500 coins and 14h and so on...
The net maker is not a priority if I have to choose. Even with 1 fishing spot, you can get 3 fish filet in about 10h40m (1h30 for lure + 2min fishing + 2 h cool down) while the net takes 21h for 3 fish filet. If the lobster pool is not ready yet for at least 2 lobsters, I don't feel the need to have the net maker.
You will certainly need lots of coins, keep farming!

