It's referred to as discernment and refinement. The more you learn, the less you buy on impulse. You are able to qualify what you want and what will work with your setups. In the beginning you may have bought without a clear objective in mind. That gives way to themes and purposeful landscaping.
I too, am lucky enough to have a lfs that will order for me. They will order plants, equipment and livestock. They also give me awesome deals at times.
I went from tanks with plants stuck in anywhere to tanks with more aesthetic arrangements.
Keep learning!