No. Stronger players don't need to do happy jumps. The lower your stats are, the more happy jumps help. For stronger players, happy jumps are not beneficial.
But you are correct that happy jumps are expensive.
What I recommend is that you rent a private island as fast as you can. The ones with 3700 happy are the best deals.
Once you are living in a private island, you'll be able to make more money. You are level 15, so you can fly. But in the palace, it's still hard to make much money flying. Using a PI will speed travel by 30%, and will allow you to carry 15 items instead of 5. (A large suitcase and faction perks can add to that, but the PI is the first big upgrade.) Those extra items mean extra profit per trip, and the PI will more than pay for itself if you fly often.
If you can't afford to rent a PI, then I suggest you
sell some losses. If you sell 4 losses, you can make enough money to buy a xanax. Using the xanax gives 250 energy, which lets you sell 10 more losses. THat turns your 100e into about a $2.5M or $3M profit. Then, while waiting on the xanax to wear off and energy to regenerate, fly for flowers or plushies. Repeat this as needed, and it won't be long before you can afford the PI. Once you're living in a PI, it's fairly easy to make $3M profit a day, and if you are really active, you can make $5M or even $6M.
And when you're making good money, you'll be able to afford to do an occasional happy jump.