In electronics engineering, we go by a rule of thumb that after the circuit is built, each effort to improve it by just 10% will double the costs.
Now don't apply this literally, but I did like sgmlaw's letter, posting the opinion that this is a hobby of diminishing returns.
Once you have a system you are happy with (didn't it knock your socks off when you bought it?) you are wise to enjoy it. Right now, people are drunk with money. The 'two-years removed' approach is very good advice, in my opinion.
Now don't apply this literally, but I did like sgmlaw's letter, posting the opinion that this is a hobby of diminishing returns.
Once you have a system you are happy with (didn't it knock your socks off when you bought it?) you are wise to enjoy it. Right now, people are drunk with money. The 'two-years removed' approach is very good advice, in my opinion.