Going paraben-free. After doing that, my annual spending on hair-related products went from something like $1,000 to less than $300.
Time is a factor as well. I've been on this hair journey since 2000, so I'm well aware that 50-11 products are not going make my hair grow faster or healthier. Now, I use a fraction of the number of products I used to. My regimen is much simplier too. My daily rotation now includes one product with paraben (Trader Joe's Nourish Spa conditioner). I also do an Aphogee treatment once every few months, which involves using three products that may contains parabens (I haven't checked).
Overall, I have no desire to buy alot of stuff for my hair anymore. I just want my hair to grow, stay long, and be healthy.