Does this still work well with much smaller numbers? say $500 and $5000
However, the reason for using the call option is the limits placed on how much money can be added to the ROTH IRA in each year. I believe the number is $5,500 per year.
So, in order to have greater gains within the IRA at non-taxable earnings is through an option.
Bottom line is you are quite limited as to the amount you can put into the IRA, but not limited as to how much it earns. Use the example of flipping a house. You could buy an option to purchase the home with your IRA for $2,000 - example) and, let's say, you think you will earn $50,000 on the flip. You could personally (or using another entity) buy the position (the option) your IRA has in the house for, say, $40,000. The entire profit ($38,000 in this example) is earned tax free. You can now use the money to do similar transactions and amass retirement wealth pretty quickly.
An example I am doing right now. I have located a ranch that I estimate is worth about $6M. I have negotiated a deal to buy it for $2M. I used my ROTH IRA to buy an option on the property for $5,000. I already have a buyer lined up that wants to take my position to purchase it for $2M. However, I am selling my option for $1.5M. (The buyer is okay paying $3.5M for the ranch.)
So I invest $5,000, earn $1.5M from that investment, and pay no taxes on the earnings. Rinse/repeat.
EDIT: You can't personally buy the option from yourself, you have to sell the option to an unrelated party.