It might be pounds of free weights
It could be tropical fish
It could be collector coins or stamps
It could be power tools
It could be books
It could be LPs, or CDs, or DVDs, or computers,
or kids, or bathrooms, or phones, etc

Whatever...
What do have more of in your house than 99% of OOTers?

For me it's golf balls. I think I have 300 to 400.