This is because tsukesage, which is sold by the roll, is less expensive than a formal kimono with an ebamono design (where the pattern spreads over the kimono without its alignment being disrupted by the seams) so it would be easier to sell to customers.
これは価格の張る絵羽物の訪問着より着尺（反物）の状態で売られている付け下げの方が安価なため客に売りやすいという意味もあった。