All the paints look the same in the bucket, but that is the only similarity that high quality and low-quality paint have. Everything else in that bucket of paint differs from one another. Low-quality paint will have a powerful odor; the ingredients will be of a low quality which will result in early peeling off paint and scuff in the colour. Low-quality paint also tends to fade over time and does not have a strong bonding with the wall or surface.
High-quality paint, on the other hand, has less odor, uses high-quality bonding material and last longer to protect your house. High-quality paint also has a more extended warranty than low-quality ones.