In addition to what others have said, I'd also like to point out that there is a difference between personal wealth and business capital. While Uncle Owen may not make enough on his farm to have frivolous disposable income, that doesn't mean the farm as a business is bankrupt.

Take a look at these tractor prices. They range from $300 to "500, which makes them comparable to luxury and sports cars in price tag, yet farmers who own them can't afford a car like that. The business has capital and it buys things because they are useful. But a sports car isn't useful for farming. It may be that the droids are quite valuable.

In addition to what others have said, I'd also like to point out that there is a difference between personal wealth and business capital. While Uncle Owen may not make enough on his farm to have frivolous disposable income, that doesn't mean the farm as a business is bankrupt.

Take a look at these tractor prices. They range from $300,000 to $500,000, which makes them comparable to luxury and sports cars in price tag, yet farmers who own them can't afford a car like that. The business has capital and it buys things because they are useful. But a sports car isn't useful for farming. It may be that the droids are quite valuable.

In addition to what others have said, I'd also like to point out that there is a difference between personal wealth and business capital. While Uncle Owen may not make enough on his farm to have frivolous disposable income, that doesn't mean the farm as a business is bankrupt. Take a look at these tractor prices. https://configure.deere.com/cbyo/#/en_us/products/agriculture/tractors/9_family_4wd-track_tractors/9r-9rt-9rx_series They are comparable to luxury and sports cars in price tag, yet farmers who own them can't afford a car like that. The business has capital and it buys things because they are useful. But a sports car isn't useful for farming. It may be that the droids are quite valuable.

In addition to what others have said, I'd also like to point out that there is a difference between personal wealth and business capital. While Uncle Owen may not make enough on his farm to have frivolous disposable income, that doesn't mean the farm as a business is bankrupt. 

Take a look at these tractor prices. They range from $300 to "500, which makes them comparable to luxury and sports cars in price tag, yet farmers who own them can't afford a car like that. The business has capital and it buys things because they are useful. But a sports car isn't useful for farming. It may be that the droids are quite valuable.