The problem among the orb is not the price. For guys wanting to dig for everything, an orb is useless (you'd tend to dig anyways), but for ones who want ONLY the pumpkins and not the bulb, an orb worthes more than the price.
If you want the sticker ONLY, or if you want a specific toy ONLY, orb gets more and more better because otherwise you would waiste whole bunch of items which is taller than an orb, just for nothing.
Orb is designed like this, and so, if you dig for the bulb, pumpkins, tools, stickers AND the toys, it's no use, and that is OK.
The real problem is that the usage is limited. To dig deeper there are only 2 choice. Candles and Lanterns because Flashligts just dig to your sides. Within the two, you tend to use up candles quicker if you use them properly. Orbs are only useful after using some candles in a row, because after using lanterns, unvisible area is small.
I would want an option to buy i.e. 30 candles (without lanterns) with a better price, if I were to use the orbs in numbers.