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There are a few key reasons why many big musicians don't re-record their old albums to gain control of the new masters:

1. Legal Restrictions: Most record deals include re-recording restrictions that prevent artists from re-recording their music for a certain period, typically between three to seven years after its release. These restrictions can sometimes extend up to 10, 15, or even 20 years.

2. Cost and Time: Re-recording an entire album requires a significant investment of time and money. It's not just about recording the music; it's also about meticulously recreating it note for note, which can be a lengthy and expensive process.

3. Publishing Rights: Artists need to own their own publishing rights to use the songs. If they don't, they would need to get permission from and potentially pay the person who holds those rights.

4. Market Impact: There's no guarantee that fans will prefer the re-recorded versions over the original ones. This uncertainty can make the investment less appealing.

5. Contractual Obligations: Some contracts may have specific clauses that further limit an artist's ability to re-record and release their old work.

Despite these challenges, some artists like Taylor Swift have successfully re-recorded their old albums to regain control over their music. It's a bold move that requires careful planning and resources.