It makes things easier for investors. Imagine a company with two divisions. One is a solid boring industry with a long history of stable growth and of turning small but consistent profits. The other is in a smaller niche industry, showing impressive growth numbers, but yet to make a profit. As in investor it is hard to value such a company. Will the large old slow growing part hold back the new fast growing part? Will the losses in the smaller division lower the potential dividends of the solid part of the company? By splitting out the parts you can appeal both to investors who like low volatility and reliable dividend payments and to investors whom are willing to accept huge risk in exchange for the chance of 10x returns.