Please note, earnings depend on a variety of factors such as the demand for the file and network connection. BitTorrent Speed operates as an open auction where earnings and spending depend on supply/demand balance. In simple words, if seeded content is in high demand and other users are ready to pay for it the earning would be significant. The amount of seeded content itself doesn't define the amount of BTT earned. The same logic is applicable to spendings.
If you want to avoid spending your BTT, you can set up where you can earn BTT but not spend. To do that, simply turn the "Speed Increase" toggle into the "Off" state. Your ability to download won't be impacted, but there will be no increase in speed.
You might see the balance changing within 24 hours after switching the Speed Increase toggle off. This happens because, when you bid on a piece of data, your BTT go to escrow first and stay there until you complete downloading the piece or until 24 hours passed - whichever comes first. If the piece was successfully downloaded, your bid goes to the seeder. If the download was not complete, BTT from escrow will be transferred back to your balance.
For any other question or doubt please do not hesitate to contact us, you can also visit BitTorrent Speed's FAQs for more useful information about BitTorrent Speed.