The Blossom Elevator is worth buying.

If you are thinking about getting the blossom elevator, it is worth getting.

The elevator gives 20 LT and 30 Silver Keys, just purchasing 20 LT is 9.99. It is worth getting the elevator bundle solely for the extra silver keys.

The worth of silver keys is hard to determine due to them giving you a guaranteed bit from one row instead of a completely random one like the LTs do. But I'd argue that the 30 keys are worth more than 2.5 LT so the elevator deal is better per dollar spent than the best LT dollar deal.

This isn't accounting for the 2.5-4x the petals earned (depending on if you watch the ad booster).